Xeroderma Pigmentosum: Man Deprived of His Right to Light

Table 1

Exogenous DNA damaging agents.

Physical agents	Chemical agents
(1) UV radiation (sunlight)	(1) Plant toxins—Aflatoxin
(2) Ionising radiation	(2) Alkylating agents
X-rays	(3) Nitroquinoline oxide derivatives
Gamma rays	(4) Acetylaminofluorene derivatives
(3) Smoke	(5) Phenanthrene derivatives